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altocumulus
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Altocumulus undulatus clouds form parallel, wavy bands across the sky, brightly illuminated in orange and gold by the setting or rising sun above a dark horizon. Illustration showing ten cloud types at different altitudes above the ground: cirrus, cirrocumulus, and cirrostratus at high elevations; altocumulus and altostratus at mid-levels; nimbostratus, stratocumulus, stratus, cumulus, and the towering cumulonimbus clouds at lower to very high elevations, with a plane for scale.
Learn about the four main types of clouds formed at different altitudes
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altocumulus

meteorology
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Altocumulus undulatus clouds form parallel, wavy bands across the sky, brightly illuminated in orange and gold by the setting or rising sun above a dark horizon.
Middle clouds

(Top to bottom) Altocumulus undulatus, a layer of shaded, regularly arranged rolls; altocumulus perlucidus, a white and gray layer in which there are spaces between the elements; altostratus translucidus, showing the Sun as if seen through ground glass; altocumulus radiatus, a layer with laminae arranged in parallel bands.

Altocumulus clouds are a mid-altitude cloud formation characterized by large, whitish, fleecy masses with shaded portions. The name "altocumulus" comes from Latin "altus" (high) and "cumulus" (heap). These clouds are part of the broader classification of clouds, which are visible masses of water droplets or ice crystals suspended in the air. Clouds form when moist air rises, expands, and cools to its dew point, causing water vapor to condense onto tiny particles. Altocumulus clouds are classified as middle clouds, typically found at heights between 2 to 7 kilometers (1 to 4 miles). They are distinct from stratus clouds, which form flat layers, and cumulus clouds, which are puffy.1234

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4 Britannica Sources
  1. altocumulus
  2. What Does a stratocumulus Cloud Look Like?
  3. climate - Cloud types
  4. cloud

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